How to make him like me?

my best friend is a girl rite she has a guy friend and she tells him about me and vice versa she says im his wanna be gilfriend(we are all 13 btw) so it means he likes me the only contact i have with him is wen we screams things down the fone wen he fones her i like him too rite ma family is too strict to let me have a boyfriend so how can i make him like me over the fone like really like me.